Images from Sr. Cpl. Norm Smith's Funeral

Jimmy Scarborough, Payne's cousin, and William Jobe were inside Payne's home the day Smith was killed and are expected back on the stand Monday after beginning their testimony last week.

Both Scarborough and Jobe said they thought they were being robbed and that Payne began shooting through the door -- unaware it was the Dallas police on the other side attempting to serve a warrant to Jobe.

Memorial Video from Sr. Cpl. Norman Smith's Funeral

Prosecutors said the testimony is a ruse to cover up the fact that Payne killed a police officer.

Last week Smith's wife, Dallas police officer Lt. Regina Smith, took the stand for the prosecution and described the news of her husband's death as the most chaotic moment in her life.

"I just had this sick feeling when I first called. He would pick up the phone immediately, every time, when he saw me [calling]. I had a strange, nasty feeling inside. It was something so unusual," said Smith.